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| All Patents in class 73/660 | |||||
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| Number | Date | Patentee | Title | Type | |
| 2,023,244 | Dec. 03, 1935 | E.J. Schnaitter | Balance Indicator | balancing machinery | |
| 2,063,127 | Dec. 08, 1936 | E.J. Schnaitter | Vibration Indicator | testing machines | |
| 2,241,637 | May 13, 1941 | A.H. Dall, H. Ernst | Dynamic Balancing Mechanism for Machine Tools | grinding machines | |